Civil Services Prep

Prelims 2024 · Science and Technology · Question 93

Which one of the following is synthesised in human body that dilates blood vessels and increases blood flow?

  1. Nitric oxide
  2. Nitrous oxide
  3. Nitrogen dioxide
  4. Nitrogen pentoxide

Answer

Nitric oxide

  • (a) Nitric oxide: It is synthesized in the human body by endothelial cells and acts as a vasodilator, relaxing smooth muscles and increasing blood flow. Correct.
  • (b) Nitrous oxide: This is laughing gas, used as an anesthetic; it is not the body’s natural vasodilator. Incorrect.
  • (c) Nitrogen dioxide: A toxic air pollutant, not a physiological signaling molecule for vasodilation. Incorrect.
  • (d) Nitrogen pentoxide: A chemical compound with no role as a human body-synthesized vasodilator. Incorrect.

Answer: (a) Nitric oxide.

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